thanks so much guys!

I have got Provia 400X, Portra 400 and 2 rolls of Portra 800. The plan is to shoot 2 rolls of Provia (1 at 400 and the other pushed to 800), 2 rolls of Portra (1 @ 400 1@800 without push; I will push a third roll to 800 if time permits) and 1-2 rolls of Portra 800.

I am definitely carrying Velvia with me, but those are for my daylight shots.....I cannot image using that for the Northern Lights.

Avi